Method for producing organic electroluminescent display device comprising polydiacetylene layers

A method for producing an organic EL display device including a plurality of pixels, the organic EL display device comprising:

• an element substrate including a substrate, a plurality of organic EL elements supported by the substrate and respectively located in the plurality of pixels, and a bank layer defining the plurality of pixels;
• and
• a thin film encapsulation structure covering the plurality of pixels,
• wherein the thin film encapsulation structure includes a first inorganic barrier layer and an organic barrier layer in contact with a top surface or a bottom surface of the first inorganic barrier layer,
• wherein the plurality of pixels include a red pixel, a green pixel and a blue pixel,
• wherein the organic EL display device further includes a first polydiacetylene layer selectively provided on the thin film encapsulation structure on the blue pixel and exhibiting a blue color and a second polydiacetylene layer selectively provided on the thin film encapsulation structure on the red pixel and exhibiting a red color, and
• wherein the first and second polydiacetylene layers are formed of a polymer of 10,12-pentacosadiynoic acid, wherein a step of forming the first and second polydiacetylene layers includes the steps of:
• after the thin film encapsulation structure is formed, depositing 10,12-pentacosadiynoic acid on the thin film encapsulation structure by mask vapor deposition;
• irradiating the 10,12-pentacosadiynoic acid with an electron beam or ultraviolet rays to form a polydiacetylene layer exhibiting a blue color;
• and
• further irradiating only a region, of the polydiacetylene layer, to be the second polydiacetylene layer with the ultraviolet rays to change the region to a polydiacetylene layer exhibiting a red color by phase transition, and wherein the step of forming the thin film encapsulation structure includes the steps of:
• preparing, in a chamber, the element substrate on which the first inorganic barrier layer is formed,
• supplying a vapor-like or mist-like photocurable resin into the chamber,
• condensing the photocurable resin on the first inorganic barrier layer to form a liquid film,
• irradiating the liquid film of the photocurable resin with light to form a photocured resin layer, and
• partially ashing the photocured resin layer to form the organic barrier layer.